US 2420963 A
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Description (OCR text may contain errors)
May 2o, 1947.
I E. J. MALO (JLOSING FLA? FOR ENVELOPES AND THE LIKE Filed May 23,
I m/enlor vPatented May 20, 1947 ori-ics cLosING Fmr Fon ENvELorEs AND THE LIKE Edward Joseph Malo, Benton Harbor, Mich. l Application May 23, 1'945, serial Nq. 595,321
More specifically, I attain the objects sought 'by corrugating the gummed sealing edge of the closing flap and, secondly, corrugating the coacting and coinciding stick down surface of the body, the corrugations of the respective areas meshing and adhering in a pre-determined manner.
Using coinciding corrugated companion areason the flap and body respectively and then applying adhesive coatings on alternating and longitudinally spaced positions, I have `found it possible to produce an envelope in which the parts will not accidently adhere prior to the regular hand sealing stage. i
Other features and advantages will become more readily apparent from the following descrip- 1 Claim. (Cl. 229-80) tion and the accompanying illustrative drawing.
In the drawing:
Figure 1 is a top plan View of a conventional letter type or equivalent envelope with its portions constructed in accordance with the principles of the present invention.
Figure 2 is an enlarged fragmentary sectional View taken approximately on the plane of the line 2-2 of Figure 1.
Figure 3 is a. fragmentary section through the envelope after the flap has ben folded down and pressed and sealed in its closing position.
Referring to the drawings by distinguishing t reference numerals, it will be seen that the body -of the envelope is indicated at d and is, for the main, of conventional construction and form.-
' The flap 5 joins the open mouth by the usual fold line 6. The ap is also'of conventional configuration. The marginal somewhat V-shaped gum-coated surface 1 differsv from the regular envelope in that is corrugated substantially from endto end. The corrugations may be described as comprising alternate flutes 8 and 9 respectively. The attaching surfaces of the flutes 8 are gumcoated, whereas intervening flutes 9 are noncoated.
'Ihe coinciding and therefore, complementa! flap receiving and anchoring area I0 on the body of the envelope is likewise, corrugated. Here the corrugations are differentiated by the numerals 8a and 9a respectively. It will be noted from the drawings that I'the corrugations again define flutes and these are alternated insofar as the gununed and non-gummed surfaces are concerned. Also, it will be observed that the flutes on the flap 'I alternate or are staggered in respect to the coacting ones on the body area I 0. Or, to put it otherwise, the' gummed flutes Bv on the flap seat in the non-summed flutes 8a, while the gummed flutes 9a on the area l0 register with the non-gummed utes 9 on .the flap l.
It is to'be understood that the flutes formed thereby form a shallow hill-and-dale companion seals and thattheflutes can beleither rectangular or semi-circular or of' other cross-sectional forms.
As a, safeguard .the flap l can be tucked into the body at the time of manufacture and packaging. However, this is not essential in an envelope of the construction shown because it isl believed that despite tropical climatic moisture conditions, the coacting surfaces on the flap and body will not adhere, that is permanently adhere, until they are actually pressed together firmly by hand. I have found that in tropical zones certain types of adhesive surfaces will cause the flaps to inadvertently seal themselves against the bodies of the envelopes. This makes a condition inconvenient and difficult for the user. On the other hand, the use of the corrugated areas t I and Il) with the especially gummed. alternating and staggered -utes wholly overcomes the objection pointed out and at the same time makes for the provision of an envelope whichv is aptly fitted for the particular purposes intended.
It is thought that persons skilled in the art to which the invention relates will be able to obtain a, clear understanding of the invention after considering the description in connection with .the drawings. Therefore, a more lengthy description is regarded as unnecessary.
` 3 the corrugado dennmg flutes, the nutes being alternately summed and plain. thu: wall of the REFERENCES CITED body with which said uted area ooacts also be- The following references are of record in the ing corrugated. the latter corrugations matching me 0f this patent; corrugations on the flap, .the corrugations on the l l body dennmg 'flutes and said num being auer- UNITED STATES PATENTS nately summed and plain. Aand the respective Numbe'x.
flutes on the body and nap being staggered in 2 131 575 ,whixgglxe se tDLfzte 19 38 relation to .the placement of the summed and '8851573 Blake Agr. 21. 1908 plain flutes, in the manner and ter the purposes l0 described.
EDWARD JOSEPH MALO.